ios手势识别（敲击，捏合，拖拽，轻扫，旋转，长按）

UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，使用它的子类才能处理具体的手势

UITapGrestureRecognizer(敲击)

UIPinchGestureRecognizer（捏合，用于缩放）

UIPanGestureRecognizer（拖拽）

UISwipeGestureRecognizer（轻扫）

UIRotationGestureRecongnizer(旋转)

UILongPressGestureRecognizer（长按）

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//给图片添加 "敲击手势"
// 1.创建一个 "敲击手势" 对象
UITapGestureRecognizer *tapGest = [[UITapGestureRecognizer alloc] init];

// 2.设置"敲击手势" 对象的属性
// 点击的次数
tapGest.numberOfTapsRequired = 1;

// 手指的数量
//tapGest.numberOfTouchesRequired = 2;

// 设置代理
tapGest.delegate = self;

// 3.把手势添加到 view 上
[self.imageView addGestureRecognizer:tapGest];

// 4.设置手势的监听方法
[tapGest addTarget:self action:@selector(tapView:)];
}

- (void)tapView:(UITapGestureRecognizer *)tapGest{
NSLog(@"%s",__func__);
}

#pragma mark 手势的代理
//告诉view能否接收 "触摸事件"
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
//左边可以 点击 /右边不可以点击
CGPoint location = [touch locationInView:touch.view];
if (location.x <= touch.view.bounds.size.width * 0.5) {
return YES;
}
return NO;
}
@end

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//给图片添加 "长按手势"
// 1.创建一个 "长按手势" 对象
UILongPressGestureRecognizer *longGest = [[UILongPressGestureRecognizer alloc] init];

// 属性
// 长按的时候
longGest.minimumPressDuration = 3;

// 长按时，距离 "触摸点" 可移动的距离
longGest.allowableMovement = 30;

// 2.把手势添加到 view 上
[self.imageView addGestureRecognizer:longGest];

// 3.设置手势的监听方法
[longGest addTarget:self action:@selector(longPressView:)];
}

- (void)longPressView:(UILongPressGestureRecognizer *)longPressGest{
// 怎么判断 "长按" 开始和结束
NSLog(@"%s 手势状态 %ld",__func__,    longPressGest.state);
if (longPressGest.state == UIGestureRecognizerStateBegan) {
NSLog(@"长按手势开始");
}else{
NSLog(@"长按手势结束");
}
}

@end

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//给图片添加 "轻扫手势"
// 1.创建一个 "轻扫手势" 对象
UISwipeGestureRecognizer *swipeGest = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeView:)];

// 属性
//UISwipeGestureRecognizerDirectionRight 向右轻扫
//UISwipeGestureRecognizerDirectionLeft    向左轻扫
//UISwipeGestureRecognizerDirectionUp    向上
//UISwipeGestureRecognizerDirectionDown 向下

swipeGest.direction = UISwipeGestureRecognizerDirectionUp;

// 2.把手势添加到 view 上
[self.imageView addGestureRecognizer:swipeGest];

}

- (void)swipeView:(UISwipeGestureRecognizer *)swipeGest{
// 怎么判断 "长按" 开始和结束
NSLog(@"%s 手势状态 %ld",__func__, swipeGest.state);

}

@end

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//给图片添加 "捏合手势"
// 1.创建一个 "捏合手势" 对象
UIPinchGestureRecognizer *pinchGest = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinView:)];

// 属性

// 2.把手势添加到 view 上
[self.imageView addGestureRecognizer:pinchGest];

}

- (void)pinView:(UIPinchGestureRecognizer *)pinGest{

// 缩放的比例是一个 "累加" 的过程
NSLog(@"%s 缩放的比例 %f",__func__, pinGest.scale);

// 设置图片的缩放

// 10x10 / 1.0
// 10*2.01 x 10*2.01 /1.01 + 1.0 = 2.01
// 10*2.01 * 3.03 x 10*2.01*3.03 / 1.03 + 2.01 = 3.03

#warning 放大图片后， 再次缩放的时候，马上回到原先的大小
//self.imageView.transform = CGAffineTransformMakeScale(pinGest.scale, pinGest.scale);

self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinGest.scale, pinGest.scale);

// 让比例还原，不要累加
// 解决办法，重新设置scale
pinGest.scale = 1;

}

@end

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//给图片添加 "旋转手势"
// 1.创建一个 "旋转手势" 对象
UIRotationGestureRecognizer *rotationGest = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationView:)];

// 属性

// 2.把手势添加到 view 上
[self.imageView addGestureRecognizer:rotationGest];

}

-(void)rotationView:(UIRotationGestureRecognizer *)rotationGest{

//旋转角度
//旋转的角度也一个累加的过程
NSLog(@"旋转角度 %f",rotationGest.rotation);

// 设置图片的旋转
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotationGest.rotation);

// 清除 "旋转角度" 的累
rotationGest.rotation = 0;

}
@end

//旋转捏合手势
#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

/**
* 默认情况下，控件只能 监听到一种 手势
* 如果要监听到多个手势，设置一个代理的方法，告知它允许 ”多个手势“ 并存
*/
// Do any additional setup after loading the view, typically from a nib.
//给图片添加 "旋转手势"
// 1.创建一个 "旋转手势" 对象
UIRotationGestureRecognizer *rotationGest = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationView:)];

// 属性
//设置代理
rotationGest.delegate = self;

// 2.把手势添加到 view 上
[self.imageView addGestureRecognizer:rotationGest];

//给图片添加 "捏合手势"
UIPinchGestureRecognizer *pinchGest = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];
[self.imageView addGestureRecognizer:pinchGest];

}

-(void)rotationView:(UIRotationGestureRecognizer *)rotationGest{

//旋转角度
//旋转的角度也一个累加的过程
NSLog(@"旋转角度 %f",rotationGest.rotation);

// 设置图片的旋转
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotationGest.rotation);

// 清除 "旋转角度" 的累
rotationGest.rotation = 0;

}

-(void)pinchView:(UIPinchGestureRecognizer *)pinchGest{
//设置图片缩放

self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinchGest.scale, pinchGest.scale);

// 还源
pinchGest.scale = 1;
}

#pragma mark 手势代理
//Simultaneous 同时发生
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

return YES;

}
@end

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

//给图片添加 "拖拽手势"
// 1.创建一个 "拖拽手势" 对象
UIPanGestureRecognizer *panGest = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];
// 添加手势
[self.imageView addGestureRecognizer:panGest];

}

-(void)panView:(UIPanGestureRecognizer *)panGest{
// 方法

//panGest.view触摸的view
//拖拽的距离 [距离是一个累加]
CGPoint trans = [panGest translationInView:panGest.view];
NSLog(@"%@",NSStringFromCGPoint(trans));

// 设置图片移动
CGPoint center = self.imageView.center;
center.x += trans.x;
center.y += trans.y;
self.imageView.center = center;

//清除 累加 的距离
[panGest setTranslation:CGPointZero inView:panGest.view];
}